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If the pair of lines ax^(2)+2hxy+by^(2)=...

If the pair of lines `ax^(2)+2hxy+by^(2)=0 (h^(2) gt ab)` orms an equilateral triangle with the line lr + my + n = 0 then (a+3b)(3a+b)=

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The correct Answer is:
`4H^2`
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